Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45f81ef5bc22482…

MALICIOUS

PDF

88.4 KB Created: 2021-03-23 19:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3734635de151e766850df22cb3c77230 SHA-1: 574e0aba0e59bba65e414a4de1e7e50ce61f2173 SHA-256: e45f81ef5bc22482e70ada4313725eef2eba6a085ab94e6f84d3a1a87ca4b340
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially malicious websites. The document body, though partially obfuscated, contains keywords related to 'PDF books' and 'ereader', likely serving as a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/award?keyword=best+ereader+for+pdf+books PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5ff0cfd07d70c.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/fHigoij/new_english_song_ringtone_download_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/8wL9yhb/zixinitapevozomojixinak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6036c085211f8.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/D0CgcUK/red_sunrise_smoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_602b56d12699e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_604e64404183e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_6022f92b3511e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_5fd84f2810611.pdfIn PDF document text
    • http://dupaleb.22web.org/kesutasiwijinawiguvat.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/AgcMjgJ/fenalapiboleguxijibidegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5fd8f9b068b51.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/anatomie_de_l_oreille_externe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_96013c3d27224078a6c7886cd0bb1184.pdf?index=trueIn PDF document text
    • http://daxepusiz.rf.gd/ailee_i_ll_show_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e05296d-4ebd-4c9b-a316-5791d53526c1/bash_script_for_loop_file_list.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_9ecfa723a06042c3866197cdad8d8ed3.pdf?index=trueIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_a4f7e770c65240dd9bd32bf35ad7f81e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6694fe52-e7e2-46fe-ba0a-ce193d00a7fe/xowifimakudolidatisa.pdfIn PDF document text
    • http://gasukexopesifu.epizy.com/boduxagisakixa.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_e8e1e785a6f64ee9b572727f5f307e84.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_46df0756b19247c49dce87bffe0eaab0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/076e5996-362f-4e83-96af-59b18f8455cd/dr_terry_wahls_protocol_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40df3724-4a59-4c6f-894c-fd1570740a6c/theoretical_framework_definition_psychology.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 5256 bytes
SHA-256: 47631a04aca175d54356ed140f300cea9b32039df846c87a2b913d7ca447e042
font_01_sfnt_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 10588 bytes
SHA-256: f928e6f9b37b6a2058a159f0aed5d1960cbe26a6453e370117e782eae59fe05c

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